IVF Calculator: Estimating Your Due Date | Your Fertility Friend

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IVF Calculator

Using an IVF Due Date Calculator

Every pregnancy is unique and different, which can make trying to decipher what to expect during a pregnancy and when to expect it an overwhelming thought. To help this, there are a number of planners and calculators available, which call on known factors and historic data in hopes of answering questions and guiding planning and decision-making around your IVF journey. Below we discuss two such estimations—IVF due date and IVF success rate.

It’s important to note that these calculators offer estimations related to your IVF journey. Results are going to vary greatly and your personal journey may not follow one trend that these calculators are based on. It’s important to combine this research with thorough doctors conversations and managing of your own expectations of what IVF will be for you.

Why use a due date calculator?

Accurately estimating when your baby will arrive helps in planning and preparation. Every pregnancy milestone is based on due date. This includes medical-related milestones like doctor’s appointments; tests and ultrasounds as well as work-related milestones like letting your employer know your expecting to estimating when your maternity leave will begin and end to starting to discuss childcare options. Then there’s things at home—getting the baby’s room painted and furnished, packing a bag for delivery day and more.

How is my due date calculated?

In instances like with IVF where the exact date of conception is known, the due date is estimated by adding 266 days to the date of conception. This estimate is more accurate than basing the calculated due date off of a menstrual cycle.

If you did not use IVF to conceive, the due date calculator calculates your due date by adding 40 weeks (280 days) to the first day of your last period under the assumption of a 28 day cycle. Your menstrual period and subsequent ovulation count as the first two weeks of pregnancy. This means that if you deliver on your actual due date, your baby is 38 weeks old, rather than 40.

How is the date of conception calculated?

In the case of in vitro fertilization, the conception date is precisely known since it is the day of the embryo transfer. In other cases, such as natural conception and conception with assistance from other fertility treatments like artificial insemination ovulation is the date of conception. Human eggs can only be fertilized for 12 to 24 hours following ovulation. This small window allows us to pretty accurately equate ovulation with conception.

Due dates are only an estimate

Whether predicted by an IVF due date calculator or other due date estimation tool, due dates are always that—an estimate. However, because people using IVF know their exact date of conception, you will get the most accurate results of any of the conception scenarios.

Ultimately, your baby will come when it’s ready, which is rarely on it’s exact due date, even if you know the exact date on conception. In fact, only 5% of babies are born on their exact estimated due date with the majority being born within a week before or after. That means a normal pregnancy will last anywhere from 38 to 40 weeks. Your doctor may determine alternative course of action, such as inducing labor or cesarean section if the baby takes too long to come out on its own.

Due date calculator versus IVF due date calculator

Traditional due date calculators are only equipped to make estimates based on the first day of your last menstrual cycle. IVF due date calendars provide more options for calculations that reflect various fertility treatments. In addition to the first day of your last period, starting points for calculations may include:

  • Conception date (date of ovulation, egg retrieval, or insemination)
  • IVF transfer date of 3-day embryo transfer
  • IVF transfer date ate of 5-day embryo (blast) transfer
  • Date of ultrasound (reverse calculation)
  • Projected due date (reverse calculation)

Some sites, like YourDueDate.com include an option to employ the Mittendorf-Williams rule. This calculation takes into consideration more factors like race, weight and coffee consumption for a more accurate result.

What does the IVF due date calculator show you?

Calculators may vary slightly in what information is reported. YourDueDate.com’s calculator reports the following:

  • Due date estimate
  • Conception date (if unknown)
  • Baby’s current estimated weight, size and heartbeat
  • Prenatal testing dates
  • Trimester stages
  • Due dates for multiples (twins, triplets)

In addition, the site’s report also mentions fun items like:

  • Timeline of development and fetal milestones
  • Famous people born on estimated due date
  • Historical moments that happened on estimated due date
  • Fun facts about estimated due date

Using an IVF due date calculator before conception

While most widely used after conceiving, IVF due date calculators can come in handy before the conception stage of your IVF journey. By plugging in various factors, number one being transfer (conception) date, you can explore various timelines and options, equipping you to make a more informed family planning decision.

Are pregnancy wheels and IVF due date calculators the same thing?

A pregnancy wheel, also called a gestation calculator, is an analog version of common IVF due date calendars found online. Like an IVF due date calendar, it relies on your last menstrual period or date of conception to calculate your due date. By rotating the wheel to align with the date of conception, you will be able to estimate your due date with great accuracy.

Many doctors, midwives and doulas still use this tool and they are available for purchase online. However, an online IVF due date calculator will accomplish the same task for free.

IVF Success Rate Calculator

Trying IVF is arguably one of the biggest decisions you’ll ever make. It has huge financial and health implications that can impact the rest of your life. One of the biggest concerns people have when considering IVF is whether or not it will work for them. It’s an important question without a clear answer.

One tool you may use to predict your IVF success rate is an IVF success rate calculator. One advantage calculators have over simple aggregate data or anecdotal research is that the information is customized to your specific situation, yielding a clearer and more accurate result.

One such calculator—IVFpredict.com—offers personalized insight about your potential IVF success rate. Its calculations are rooted in five years worth of medical records and have been shown to predict success rate within 99% accuracy. Plus, it’s free to use.

Why use an IVF success rate calculator?

Hundreds, if not more, X-factors lead to the outcome of each IVF cycle. Nothing is guaranteed and even the most “ideal” candidates may find IVF does not work for them. However, there is data available to help estimate what your success rate might look like. Again, results vary a ton regardless of the factors and issues you may or may not be facing, but doing your research before making your IVF decision is still wise.

What factors does an IVF success rate calculator use to estimate success rate?

IVF success rate calculators look at many factors, which may include some or all of the following:

  • Patient age
  • How long she’s been trying to conceive
  • Ovulation issues
  • Whether donor or a mother’s own eggs will be used
  • Any diagnosed causes of infertility
  • How many times you’ve attempted IVF (and if they were successful)
  • Pregnancy history
  • Fertility medications you are/plan to use
  • Whether or not your doctor has suggested Intracytoplasmic Sperm Injection (ICSI)
  • 3 or 5 day embryo transfer
  • Embryo freezing method
  • Number of embryos transferred

Will IVF work for me?

Let’s explore how some of the factors analyzed by an IVF success rate calculator can influence your chances of having a successful IVF cycle.

Fertility issue

An inability to conceive naturally is the number one reason people turn to IVF. Causes of infertility vary greatly and may or may not be specifically diagnosable. Male infertility issues such as low sperm motility or low sperm count are good candidates to be overcome by IVF. Female fertility issues like blocked fallopian tubes, irregular ovulation and endometriosis also have a relatively good chance of being overcome by IVF. Fertility issues that are less successful are: long term infertility, infertility issues with both the male and female, fibroid tumors, uterine abnormalities and ovarian dysfunction.


Age plays a significant role in how successful any pregnancy is and it’s no different with IVF. Women under 35 are significantly more likely to have a successful round of IVF than women 40–44. Many couples turn to IVF as conceiving naturally becomes more difficult with age because even though the IVF success rate may be lower for older women, it’s significantly higher than trying to conceive naturally, especially after prolonged periods of trying.

Previous pregnancy

If you’ve previously been able to conceive, either naturally or through assisted reproductive technology, your likelihood of success with IVF is higher. If you’ve experienced multiple miscarriages it can be a predictor of failed IVF cycles depending on what your doctor determines is the cause of the miscarriages.

Fertility clinic

The clinic you choose can affect your IVF success rate. Factors such as staff experience, clinic specialization, lab technology and equipment and more can influence the success rate of IVF for you.


Smoking and weight have huge implications on your IVF success rate. Smoking can cause infertility issues in even the healthiest couples and it’s imperative to stop smoking if you want to up your chances of IVF working for you. Weight can affect your ability to absorb fertility medications and hormones, mess with your ovulation and menstrual cycle and interfere with your ability to carry a baby full term. 

What is the average success rate of IVF?

The Society for Assisted Reproductive Technology (SART) reports the success rate of live birth per one cycle of IVF as:

  • Women under 35: 40-43%
  • Women 35-37: 33-36%
  • Women 40-44: 13-18%
  • Women over 44: pregnancy is rare

SART is a professional organization made up of individuals in the field of assisted reproductive technology. These leaders are committed to upholding standards of the industry to serve patients better.

The Center for Disease Control (CDC) confirms data submitted by fertility clinics and reports out on overall trends. Per the CDC, roughly 1.6% of children born in the United States each year were conceived using some type of assisted reproductive technology.

Fertility clinics are not the best source of information on IVF success rates

Many fertility clinics report their own data on IVF success rates. While it’s true that success rate can vary from clinic to clinic, which can be useful for clinic comparison once you’ve decided to move forward with IVF, it’s important to really dig into self-reported numbers.

Fertility clinics mays choose to report on live birth rate or pregnancy rate. Live birth rate is the number of live births (full term pregnancies) over number of IVF cycles. The pregnancy rate is the number of pregnancies that matured to any stage of gestation over the number of IVF cycles. Some clinics go as far as to count chemical pregnancies—measured by elevated HCG levels present in the first few weeks following transfer—as pregnancies.

Am I likely to miscarry if I do IVF?

Having a miscarriage during IVF is no more likely than women who naturally conceive. However, tubal (ectopic) pregnancies do occur in roughly 3-5% of IVF pregnancies and call for immediate medical attention.

Other IVF Calculators

IVF Cost Calculator

Cost is a huge factor in deciding whether or not IVF is right for you. IVF is not a  one-size-fits-all procedure, which means cost varies greatly from patient to patient.  This calculator estimates the costs associated with what you need to have the highest likelihood of success with IVF.

ARC® Fertility Calculator

One in eight couples experience infertility issues. This calculator helps determine whether or not its time to see your doctor about why you haven’t been able to conceive. From there, you’ll be able to determine the proper course of action—IVF or otherwise—that makes the most sense for you.